A131252 A052509 * A000012.

1, 2, 1, 4, 3, 1, 7, 6, 3, 1, 12, 11, 7, 3, 1, 20, 19, 14, 7, 3, 1, 33, 32, 26, 15, 7, 3, 1, 54, 53, 46, 30, 15, 7, 3, 1, 88, 87, 79, 57, 31, 15, 7, 3, 1, 143, 142, 133, 104, 62, 31, 15, 7, 3, 1

Offset

0,2

Comments

Left border = A000071, Fibonacci numbers - 1, starting with F(3): (1, 2, 4, 7, 12, ...). Row sums = A131253: (1, 3, 8, 17, 34, 64, 117, ...).

Links

Table of n, a(n) for n=0..54.

Formula

A052509 * A000012, where A000012 = (1; 1,1; 1,1,1; ...).

Example

First few rows of the triangle:
   1;
   2,  1;
   4,  3,  1;
   7,  6,  3,  1;
  12, 11,  7,  3,  1;
  20, 19, 14,  7,  3,  1;
  33, 32, 26, 15,  7,  3,  1;
  ...

Crossrefs

Cf. A000071, A000012, A052509, A131253.

Sequence in context: A126570 A048790 A027421 * A345123 A133805 A131254

Adjacent sequences: A131249 A131250 A131251 * A131253 A131254 A131255

Keyword

nonn,tabl

Author

Gary W. Adamson, Jun 23 2007

Status

approved